In the preparatory course, there were books like Project and Hotline. I think someone named Tom Hutchinson had written these books, and they had received awards. I remember seeing these mentioned on the back covers of the books. There was also a book called "English for a Changing World" for American English. Besides, there were other books like Streetwise, Headway, and Way Ahead. I also recall the English textbook by the Ministry of Education that has been used for 50 years, titled "An English Course for Turks."